As a serious aside from my recent post in the Couplet of Questions thread; there is a German saying:
Bier nach Wein, das geht fein;
Wein nach Bier, das geht schwer.

Beer after wine, that's just fine,
Wine after beer; no bloody fear!

as a loose translation. Observations on the truth or otherwise of this homily? And what would be the biological processes involved that would make the difference?

Are there similar sayings the truth of which are to be empirically determined by the adventurous amongst us?

Rod